Tankless Water Heater Electric 27kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Self-Modulating Saving Energy for Residential Whole House Shower, 114A GRAY
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Availability:
In Stock.
Arrives
Wednesday, Jun 18
Style: 27kW
Features
- [Instant Unlimited Hot Water] - On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35F Rise. Requires 120Amp breaker (3 Sets of Double-pole 40AMP Breakers)
- [Self-modulating Power] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
- [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
- NOTE - Make sure this water heater is the correct size for your hot water need: 27kW 208 ~ 240V (adjustable) draw max 114Amp; Required breaker: 3 x Double-POLE 40AMP; Wire gauge 3 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT
Manufacturer: thermomate
Part Number: ET270
Item Weight: 21.7 pounds
Product Dimensions: 13.12 x 13.12 x 17.12 inches
Item model number: ET270
Size: 240V/27kW
Color: Gray
Style: 27kW
Power Source: 208~240V Hardwire
Voltage: 240 Volts (AC)
Wattage: 27 KW
Amperage Capacity: 114 Amps
Maximum Power: 27 Kilowatts
Installation Method: Wall-Mounted
Temperature Range: 80-140 Degrees Fahrenheit
Maximum Pressure: 150 Pound per Square Inch
Mounting Type: Wall
Certification: ETL
Special Features: Instant hot water, Leaking free & Maintenance free heating element
Included Components: Mount Kit
Batteries Included?: No
Batteries Required?: No
Date First Available: January 23, 2021
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Jun 18
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: 18kW
***UPDATE*** Month 1 after installing the unit, my electric bill went from $350 the prior month down to $230 the following month. So this has had clear and immediate cost savings for my electrical usage. Very happy with the results! ---------------------- I wanted to replace my traditional tank water heater with an electric tankless, so I did hours of research and comparing models and options. Finally settled on this unit in the 18KW size to fit my needs. I wanted to the next higher up but my electrical panel and home service capacity made that a risk choice. However, I'm delighted at how well the 18kw model works for my whole home use-case. Thankfully due to having an EV, I already had a conveniently located sub-panel installed. All I had to do was upgrade the capacity on that sub-panel, which was as simple as buying a larger breaker and making sure the existing wiring was up to the task. Ended up taking out the old 30amp breaker the tank water heater used out of the main panel, installing a 40-amp dual pole breaker there in its place, then upgraded my sub-panel to 100amps, and finally installing the second 40-amp dual pole breaker in the sub-panel. Ran all the 8 AWG wire to the location where I wanted to mount the water heater and used an appropriate amount of conduit and secured to the wall, which for me thankfully was only about 6 feet of distance. If you have complex electrical situations happening, definitely call in a licensed electrician. At this point it was an easy install to mount the unit on the wall, secure the wiring which was intuitive, and wall labeled. I didn't find any of the wiring or instructions to be wrong or confusing so thats a plus. The moment of truth then arrived, powering on the unit and setting the desired water temperature. A few quick tests and bingo, hot water. Its not been 3 days since the install and multiple showers, laundry, running the dishwasher, etc. No issues whatsoever. In fact, this unit outperforms the tank water heater we had before. My family now reports that they have to set the faucet to a less hot position than they did previous during showers. The water flow is perfect even when both showers are running full blast. We get consistently hot water and don't have to adjust it multiple times during the course of the shower as we did with the old water heater. Overall, very happy with the performance of this unit! My application is a single story, 2 full bath home, so I wanted something that could handle two concurrent showers and the occasional hand washing or laundry running at the same time. And I'm thrilled to say that it works for me better than expected. I also love that its a newer design that separates the heating element from the water flow path, which means less maintenance and easier repairs if something goes wrong in the future. Time will tell in terms of durability, but I was impressed with the quality of the build, its well-made and appears to be a thoughtful and clean design. Other units I checked out before buying this one looked sloppy, not as well designed. I'm so glad I chose this model. Obviously do your research on your electrical capacity, sizing for your use-case, etc. All I can say is that it works for me in my whole house use-case in Central Florida. Northern cold climates may need a more powerful unit. For me, I've got no doubt this will be more efficient and save me money on my monthly electric bill compared to the old unit electrical consumption. To top it all off, I got this on Amazon Prime Day using a deal and the cost was unbeatable for what I got in this unit. Super happy, will update the review in the future should anything else happen to change my mind.
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Reviewed in the United States on October 17, 2023 by Joe
Style: 18kW
I just replaced my old tank water heater with this 18kw tankless electric unit, and it is awesome! Even when it’s working, it doesn’t make a sound. I love that I can easily adjust the water temperature heating level, and it works great! I was kinda worried that my cold ground water (~ 57 degrees) might not get hot enough, but it handles it like a pro. I have it set at 125, which is plenty hot, and the unit goes up to 140! It’s just me and my dog, so there is no issue with water flow or functionality. I definitely recommend, and I can’t wait to see my electric bills over the next few months to see how much they drop!
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Reviewed in the United States on May 12, 2025 by LNcouch LNcouch
Style: 11kW
Does the job as specified.
Reviewed in the United States on May 10, 2025 by Denny S.
Style: 18kW
This tankless water heater works really well. The water is heated constantly. With the 18K model, we are 3 people in the house with two bathrooms and never have issues with hot water. It has been 4 months. Will see how long it will last. So far so good.
Reviewed in the United States on October 20, 2024 by Dara Ung
Style: 18kW
The media could not be loaded. I just paid $2300 to have a licensed plumber and electrician install and test this. Water is only luke warm now. The unit reads it will heat to 140 degrees F, but when I turn it up to 125 to get water hot enough to bathe in it simply sits at 95-98 and won't get hotter than 100 :( very upset, took a very cold and uncomfortable shower. Our previous water heater worked great, we just wanted to go electric. Even if I return this I will not get the 2k back I paid for installation. Why will it not heat? No support so far. We typically like to take very hot showers and baths here and bought this on the pretense that it would make hot enough water to fill both bath tubs at the same time but now the water does not get hot enough to even fill one tub. It's cold by the time it fills because the water only comes out 95 degrees. DO NOT BUY THIS IT DOES NOT WORK. please refund me, I'm now almost 3k in the hole and would re install my old working heater but they took it when they installed this one.
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Reviewed in the United States on October 25, 2023 by Maxanne Hermes
Style: 18kW
SO MANY REASONS TO SWITCH TO TANKLESS!! Once installed the cost savings are immediate, plus the confidence of never running out of hot water are worth every penny. This was a replacement unit for one bought when tankless water heaters first came out and the added features of this new model, like visual temperature readings, are great. The model is smaller and more compact, nicely designed, easy to install. Packaged extremely well for shipment, shipped within a day or two of order, and delivered as scheduled. Installation instructions were thorough, understandable and included drawings to help installer avoid confusion. Run the dishwasher, load of clothes and take a shower/bath simultaneously without fear of running out of hot water ever again! This model can support it. Note; Might need a bigger unit depending on the # of bathrooms.
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Reviewed in the United States on January 20, 2025 by Army Mom
Style: 18kW
This is the absolutely amazing I love it I love how I never run out of hot water
Reviewed in the United States on April 8, 2025 by Holly Thomas
Style: 18kW
The media could not be loaded. I installed this water heater 13 months ago in my daughter’s house. She has a one bathroom home, and it has served well. However, a week ago, the unit stopped heating water. “HH” Is shown on the display. I immediately went online and entered a trouble ticket with Thermomate. The next day I called the customer support number and was encouraged that a person picked up almost immediately. John Is friendly, and did send me a troubleshooting pamphlet. We performed the steps on the pamphlet and let Jon know that did not fix it. After this, the issue got escalated to the support department . As the support department is overseas, I had to wait 24 hours for a reply. However, the ultimate solution was that they are sending me a new hot water heater. So they are honoring their two-year warranty. Easy service to work with, And as I said, the unit was easy to install and has worked fine.
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Reviewed in the United States on July 3, 2024 by Bo Villemain